I replace the water pump impeller every 2 years in my boat... It is done as part of the yearly maintenance...
As Woodsy points out, it is cheap insurance.
Having had one fail, as JRC did, it sucks being stranded... I noticed very quickly as the engine started to run hotter then normal and shut things down immediately.... but my day and weekend where over....
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Life is about how much time you can spend relaxing... I do it on an island that isn't really an island.....
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